brake sensor MERCEDES-BENZ GLK SUV 2012 Owners Manual

Fuse box in the luggage compart-
ment
.............................................. 347
Important safety notes ..................346 G
Gear or selector lever (cleaning
instructions) ...................................... 322
Genuine Mercedes-Benz parts .........362
Glove compartment ..........................297 H
Handbrake see Parking brake
Hazard warning lamps ......................114
Headlamp Cleaning system (function) ............114
Cleaning system (notes) ................372
Headlamps
Misting up ...................................... 117
Topping up the cleaning system ....317
see Automatic headlamp mode
Head restraints
Adjusting ......................................... 98
Adjusting (electrically) .....................99
Adjusting (manually). .......................98
Adjusting (rear) ................................ 99
Fitting/removing (rear) ....................99
see NECK-PRO head restraints
see NECK-PRO head restraints/
NECK-PRO luxury head restraints
Heating
see Climate control
High-pressure cleaners ....................318
Hill start assist .................................. 150
HOLD function Display message (12-button mul-
tifunction steering wheel) ..............271
Display message (4-button multi-
function steering wheel) ................270
Function/notes ............................. 186 I
Ignition lock see Key positions
Immobiliser .......................................... 71Indicator and warning lamps
Coolant .......................................... 292
DISTRONIC PLUS ........................... 294
Engine diagnostics .........................291
Fuel tank ........................................ 292
Overview (12-button multifunc-
tion steering wheel) .........................34
Overview (4-button multifunction
steering wheel) ................................ 32
Indicator lamps
see Warning and indicator lamps
Insect protection on the radiator ....315
Inspection see ASSYST PLUS
Instrument cluster (12-button mul-
tifunction steering wheel)
Indicator and warning lamps ............34
Overview .......................................... 33
Settings ......................................... 238
Instrument cluster (4-button mul-
tifunction steering wheel)
Indicator and warning lamps ............32
Overview .......................................... 31
Instrument cluster lighting ..............239
Multifunction steering wheel with
4 buttons ....................................... 224
Intelligent Light System
Activating/deactivating (12-but-
ton multifunction steering wheel) ..240
Display message (12-button mul-
tifunction steering wheel) ..............263
Overview ........................................ 114
Interior lighting ................................. 117
Automatic control system ..............118
Delayed switch-off (12-button
multifunction steering wheel) ........241
Emergency lighting ........................118
Manual control ............................... 118
Overview ........................................ 117
Reading lamp ................................. 117
Setting brightness for display/
switches (on-board computer) .......239
Interior motion sensor ........................73
ISOFIX child seat securing system ....57 Index
13

On-board computer (4-button mul-
tifunction steering wheel)
Displaying service messages .........312
Display messages ..........................245
Individual vehicle settings ..............225
Message memory .......................... 245
Operating ...................................... .225
Range ............................................ 226
Standard displa y............................ 226
Time/date ..................................... 227
Trip computer ................................ 226
Opening and closing the side trim
panels ................................................. 121
Operating safety Diagnostics connection ...................26
Operating system
see On-board computer
Outside temperature
Display (12-button multifunction
steering wheel) .............................. 227
Display (4-button multifunction
steering wheel) .............................. 225
Overhead control panel ......................39
Override feature Rear side windows ...........................64 P
Paint code .......................................... 364
Paintwork (cleaning instructions) ...319
Panic alarm .......................................... 42
Panorama sliding sunroof Important safety information ...........92
Opening/closing .............................. 92
Opening/closing the roller sun-
blind ................................................. 93
Problem (malfunction) .....................94
Rain closing feature .........................92
Resetting ......................................... 93
Parking ............................................... 164
Important safety notes ..................164
Parking brake ................................ 165
Position of exterior mirror, front-
passenger side ............................... 105
Reversing camera ..........................196
see PARKTRONIC Parking aid
Active Parking Assist .....................192
see Exterior mirrors
see PARKTRONIC
Parking brake .................................... 165
Display message (12-button mul-
tifunction steering wheel) ..............253
Display message (4-button multi-
function steering wheel) ................248
Notes/function .............................. 165
Warning lamp ................................. 291
Parking lamp
Display message (12-button mul-
tifunction steering wheel) ..............262
Display message (4-button multi-
function steering wheel) ................259
Parking lamps
Changing bulbs .............................. 120
Switching on/off ........................... 112
PARKTRONIC
Deactivating/activating .................190
Driving system ............................... 188
Function/notes ............................. 188
Important safety notes ..................188
Problem (fault) ............................... 192
Sensor range ................................. 188
Trailer towing ................................. 191
Warning displa y............................. 189
PASSENGER AIRBAG OFF warning
lamp ...................................................... 56
Petrol .................................................. 366
Plastic trim (cleaning instructions) .322
Power windows see Side windows
PRE-SAFE ®
(preventative occupant
protection) Display message (12-button mul-
tifunction steering wheel) ..............254
Display message (4-button multi-
function steering wheel) ................249
PRE-SAFE ®
(preventive occupant
safety system) Operation ........................................ .48
PRE-SAFE ®
Brake
Activating/deactivating .................237
Display message (12-button mul-
tifunction steering wheel) ..............255 Index
17

Roller sunblind
Opening/closing .............................. 93
Panorama sliding sunroo f................ 93
Roof carrier ........................................ 304
Roof lining and carpets (cleaning
instructions) ...................................... 323
Roof load (maximum) ........................372
Route (navigation) see Route guidance (navigation)
Route guidance (navigation) ............232 S
Safety Children in the vehicle .....................54
Child restraint systems ....................54
Safety net
Attaching ....................................... 302
Important safety information .........301
Safety system
see Driving safety system
Seat
Folding the backrest (rear com-
partment) forwards/back ..............299
Seat belt
Activating/deactivating seat-belt
adjustment (12-button multifunc-
tion steering wheel) .......................243
Adjusting the driver's and front-
passenger seat belt .........................51
Adjusting the height ......................... 52
Belt force limiter .............................. 53
Belt tensioner .................................. 53
Centre rear-compartment sea t........ 52
Cleaning ......................................... 323
Display message (12-button mul-
tifunction steering wheel) ..............255
Display message (4-button multi-
function steering wheel) ................249
Fastening ......................................... 51
Important safety guidelines .............50
Rear seat belt status indicator .........53
Releasing ......................................... 52
Warning lamp ................................. 284
Warning lamp (function) ................... 52 Seats
Adjusting (electrically) .....................98
Adjusting (manually and electri-
cally) ................................................ 98
Adjusting lumbar support ..............100
Adjusting the 4-way lumbar sup-
port ................................................ 100
Adjusting the head restraint ............98
Cleaning the cover .........................323
Correct driver's seat position ........... 96
Folding the rear bench seat for-
wards/back ................................... 298
Important safety notes ....................97
Seat heating problem ....................101
Seat ventilation problem ................101
Storing settings (memory func-
tion) ............................................... 106
Switching seat heating on/off .......100
Switching the seat ventilation on/
off .................................................. 101
Sensors (cleaning instructions) .......321
Service see ASSYST PLUS
Service Centre
see Qualified specialist workshop
Service menu (12-button multi-
function steering wheel) ..................238
Service products
AdBlue ®
special additive s.............. 368
Brake fluid ..................................... 371
Coolant (engine) ............................ 371
Engine oil ....................................... 369
Fuel ................................................ 365
Important safety notes ..................365
Washer fluid .................................. .372
Settings
Factory (12-button multifunction
steering wheel) .............................. 244
On-board computer (12-button
multifunction steering wheel) ........238
Setting the air distribution ...............133
Setting the airflow ............................134
Shifting to neutral (manual trans-
mission) ............................................. 154
Short journeys (diesel particle fil-
ter) ...................................................... 167
Sidebag ................................................ 47 Index
19

If ABS intervenes when braking, you will feel
a pulsing in the brake pedal.
The pulsating brake pedal can be an indica-
tion of hazardous road conditions, and func-
tions as a reminder to take extra care while
driving.
Off-road ABS (vehicles with the Off-
Road Engineering package) An ABS system specifically suited to off-road
terrain is activated automatically once the off-
road drive program (Y page 215) is activated.
At speeds below 30 km/h, the front wheels
lock cyclically during braking. The digging-in
effect achieved in the process reduces the
stopping distance when driving off-road. This
limits steering capability. BAS (Brake Assist System)
i Observe the "Important safety notes" sec-
tion (Y page 65). G
WARNING
If BAS is malfunctioning, the braking distance
in an emergency braking situation is
increased. There is a risk of accident.
In an emergency braking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.
BAS operates in emergency braking situa-
tions. If you depress the brake pedal quickly,
BAS automatically boosts the braking force,
thus shortening the stopping distance.
X Keep the brake pedal depressed firmly until
the emergency braking situation is over.
ABS prevents the wheels from locking.
The brakes will function as usual once you
release the brake pedal. BAS is deactivated. BAS PLUS (Brake Assist System Plus)
i Observe the "Important safety notes" sec-
tion (Y page 65). BAS PLUS is only available on vehicles with
DISTRONIC PLUS.
BAS PLUS provides braking assistance in haz-
ardous situations at speeds greater than
7 km/h and uses radar sensor technology to
assess the traffic situation.
With the help of the radar sensor system, BAS
PLUS can detect obstacles that are in the
path of your vehicle for an extended period of
time.
At speeds up to approximately 70 km/h, BAS
PLUS may also detect stationary obstacles,
for example, stopped or parked vehicles.
To prevent a front-end collision, BAS PLUS
calculates the brake force necessary if:
R
you approach an obstacle, and
R BAS PLUS has detected a risk of collision
When driving at a speed over 30 km/h: if
you depress the brake sharply, BAS PLUS
automatically increases the brake pressure to
a degree suited to the traffic situation.
When driving at a speed under 30 km/h:
if you depress the brake, BAS PLUS is activa-
ted. Braking will be carried out at the last
possible moment.
If BAS PLUS demands particularly high brak-
ing force, preventative passenger protection
measures (PRE-SAFE ®
) are activated simul-
taneously.
X Keep the brake pedal depressed until the
emergency braking situation is over.
ABS prevents the wheels from locking.
BAS PLUS is deactivated and the brakes func-
tion as usual if:
R you release the brake pedal
R there is no longer any danger of a rear-end
collision
R no obstacle is detected in front of your
vehicle
Vehicles with COMAND and a navigation sys-
tem: the radar sensor system is switched off
automatically in the vicinity of radio telescope
facilities (Y page 375). 66
Driving safety systemsSafety

Vehicles without COMAND and a navigation
system and vehicles for Australia: the radar
sensor system and on-board computer must
be switched off in the vicinity of radio tele-
scope facilities (Y page 242).
For BAS PLUS to assist you when driving, the
radar sensor system must:
R be switched on (Y page 242)
R be operational (Y page 272)
If the radar sensor system is malfunctioning,
BAS PLUS will not be available. The brake
system is still available with complete brake
boosting effect and BAS. G
WARNING
BAS PLUS cannot always clearly identify
objects and complex traffic situations. BAS
PLUS cannot intervene in these cases. There
is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
In particular, the detection of obstacles can
be impaired if there is:
R dirt on the sensors or anything else cover-
ing the sensors
R snow or heavy rain
R interference by other radar sources
R the possibility of strong radar reflections,
for example, in multi-storey car parks
R a narrow vehicle travelling in front, e.g. a
motorcycle
R a vehicle travelling in front on a different
line G
WARNING
BAS PLUS does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering
As a result, BAS PLUS may not intervene in all
critical situations. There is a risk of an acci-
dent. Always pay careful attention to the traffic sit-
uation and be ready to brake.
Following damage to the front end of the vehi-
cle, have the configuration and operation of
the radar sensors checked at a qualified spe-
cialist workshop. This also applies to colli-
sions at slow speeds where there is no visible
damage to the front of the vehicle. Adaptive brake lamps
i Adaptive brake lamps are only available in
certain countries.
If you brake sharply from a speed of more
than 50 km/h or if braking is assisted by BAS,
the brake lamps flash rapidly. In this way,
traffic travelling behind you is warned in an
even more noticeable manner.
If you brake sharply from a speed of more
than 70 km/h to a standstill, the hazard warn-
ing lamps are activated automatically. If the
brakes are applied again, the brake lamps
light up continuously. The hazard warning
lamps switch off automatically if you travel
faster than 10 km/h. You can also switch off
the hazard warning lamps using the hazard
warning switch button (Y page 114). ESP
®
(Electronic Stability Program)
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 65). G
WARNING
If ESP ®
is malfunctioning, ESP ®
is unable to
stabilise the vehicle. In addition, other driving
safety systems are switched off. This increa-
ses the risk of skidding and an accident.
Drive on carefully. Have ESP ®
checked at a
qualified specialist workshop. Driving safety systems
67Safety Z

SAFE
®
Brake has detected a risk of collision,
you will be warned visually and acoustically
as well as by automatic braking. PRE-SAFE ®
Brake cannot prevent a collision without your
intervention.
This function will issue a warning if:
R at speeds of around 30 km/h or more, over
several seconds, the distance maintained
to the vehicle travelling in front is insuffi-
cient.
The · distance warning lamp then lights
up in the instrument cluster.
R at a speed of approximately 7 km/h or
higher, you very quickly approach a vehicle
in front.
An intermittent warning tone will then
sound and the ·distance warning lamp
will light up in the instrument cluster.
X Brake immediately in order to increase the
distance from the vehicle in front.
or
X Take evasive action provided it is safe to do
so.
From a speed of approximately 7 km/h, if the
driver and front passenger have fastened
their seat belts, PRE-SAFE ®
Brake can brake
the vehicle automatically at speeds up to
approximately 200 km/h.
Due to the nature of the system, particularly
complicated driving conditions may cause
unnecessary warnings or the unnecessary
intervention of PRE-SAFE ®
Brake.
You can prevent the intervention of the PRE-
SAFE ®
Brake at any time by:
R depressing the accelerator pedal further
R activating kickdown
R releasing the brake pedal The braking action of PRE-SAFE
®
Brake is
ended automatically if:
R you manoeuvre to avoid the obstacle.
R there is no longer any danger of a rear-end
collision.
R there is no longer an obstacle detected in
front of your vehicle.
With the help of the radar sensor system,
PRE-SAFE ®
Brake can detect obstacles that
are in front of your vehicle for an extended
period of time.
At speeds up to approximately 70 km/h, PRE-
SAFE ®
Brake can also detect stationary
obstacles such as stopped or parked vehi-
cles.
If you approach an obstacle and PRE-SAFE ®
Brake detects a risk of a collision, the system
will alert you both visually and acoustically. If
you do not brake or take evasive action, the
system will warn you by automatically braking
the vehicle gently. If there is an increased risk
of collision, preventative passenger protec-
tion measures (PRE-SAFE ®
) are activated
(Y page 48). If the risk of collision remains
and you do not brake, take evasive action or
accelerate significantly, the vehicle may per-
form automatic emergency braking. Auto-
matic emergency braking is not performed
until immediately prior to an accident that can
no longer be avoided. G
WARNING
PRE-SAFE ®
Brake will initially brake your vehi-
cle by a partial application of the brakes if a
danger of collision is detected. There may be
a collision unless you also brake. Automatic
emergency braking cannot prevent a colli-
sion. There is a risk of an accident.
Always apply the brakes yourself and try to
take evasive action. G
WARNING
PRE-SAFE ®
Brake cannot always clearly iden-
tify objects and complex traffic conditions. 70
Driving safety systemsSafety

In these cases, PRE-SAFE
®
Brake may:
R give an unnecessary warning and then
brake the vehicle
R neither give a warning nor intervene
There is a risk of an accident.
Always pay particular attention to the traffic
situation and be ready to brake, especially if
PRE-SAFE ®
Brake warns you. Terminate the
intervention in a non-critical driving situation.
In particular, the detection of obstacles can
be impaired if there is:
R dirt on the sensors or anything else cover-
ing the sensors
R snow or heavy rain
R interference by other radar sources
R the possibility of strong radar reflections,
for example, in multi-storey car parks
R a narrow vehicle travelling in front, e.g. a
motorcycle
R a vehicle travelling in front on a different
line G
WARNING
PRE-SAFE ®
Brake does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering
As a result, PRE-SAFE ®
Brake may neither
give warnings nor intervene in all critical sit-
uations. There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
In order to maintain the appropriate distance
to the vehicle in front and thus prevent a col-
lision, you must apply the brakes yourself.
X To activate/deactivate: activate or deac-
tivate PRE-SAFE ®
Brake in the on-board
computer (Y page 237).
When PRE-SAFE ®
Brake is activated, the
Ä symbol appears in the multifunction display, as long as the HOLD function is
deactivated (Y
page 186).
On vehicles with Parking Guidance, the
Ä symbol is displayed when Pis
engaged or you are driving faster than
35 km/h.
For PRE-SAFE ®
Brake to assist you when driv-
ing, the radar sensor system must:
R be switched on (Y page 242)
R be operational (Y page 272)
Vehicles with COMAND and a navigation sys-
tem: the radar sensor system is switched off
automatically in the vicinity of radio telescope
facilities (Y page 375).
Vehicles without COMAND and a navigation
system and vehicles for Australia: the radar
sensor system and on-board computer must
be switched off in the vicinity of radio tele-
scope facilities (Y page 242).
Following damage to the front end of the vehi-
cle, have the configuration and operation of
the radar sensors checked at a qualified spe-
cialist workshop. This also applies to colli-
sions at slow speeds where there is no visible
damage to the front of the vehicle. Anti-theft systems
Immobiliser
The immobiliser prevents your vehicle from
being started without the correct key.
X To activate with the key: remove the key
from the ignition lock.
X To activate with KEYLESS-GO: switch the
ignition off and open the driver's door.
X To deactivate: switch on the ignition.
i The immobiliser is always deactivated
when you start the engine. Anti-theft systems
71Safety Z

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variations are pos-
sible. Note that your vehicle may not be
equipped with all of the functions descri-
bed. This is also the case for systems and
functions relevant to safety.
i Read the information on qualified special-
ist workshops: (Y page 27). Key
Important safety notes
G
WARNING
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then not
possible to open the doors from inside the
vehicle.
Therefore, do not leave any people behind in
the vehicle, particularly children, elderly peo-
ple or people in need of special assistance if
the vehicle has been locked with the key. As
a result, they may not be able to free them-
selves in the event of an emergency. As a
result, they could be seriously or even fatally
injured by prolonged exposure to extremely
high or low temperatures, for example. In this
case, rescuing people from outside the vehi-
cle is difficult.
Deactivate the interior motion sensor before
you lock the vehicle with the key. The doors
can then be opened from the inside after the
vehicle has been locked from the outside with
the key. G
WARNING
If children are left unsupervised in the vehicle,
they could: R
open a door from inside the vehicle at any
time, even if it has been locked
R start the vehicle using a key which has been
left in the vehicle
R release the parking brake
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time. G
WARNING
If a key ring is too heavy or too large, the
weight acting on the key could cause it to turn
in the ignition lock or catch on the steering
wheel. This could cause the engine to be
switched off suddenly. You may lose control
of the vehicle and cause an accident. Do not
attach any heavy or large key rings to the key
that is inserted in the ignition.
R Do not keep the KEYLESS-GO key:
-with electronic devices, e.g. a mobile
phone or another key
- with metallic objects, e.g. coins or metal
film
- with metallic objects, e.g. a metal case
This can affect the key's functionality.
Keep the key away from strong magnetic
fields. Otherwise, the remote control function
could be affected. Key functions
The key centrally locks/unlocks:
R the doors
R the tailgate
R the fuel filler flap 76
KeyOpening and closing

Problem Possible causes/consequences and
M
MSolutions You have lost the emer-
gency key element. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. The engine cannot be
started using the key. The on-board voltage is too low.
X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 337).
or
X Jump-start the vehicle (Y page 341).
or
X Consult a qualified specialist workshop. The engine cannot be
started using KEYLESS-
GO. The key is in the
vehicle. A door is open. Therefore, the key cannot be detected as easily.
X
Close the door and try to start the vehicle again. There is interference from a powerful source of radio waves.
X
Start your vehicle with the key in the ignition lock. Doors
Important safety notes
G
WARNING
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then not
possible to open the doors from inside the
vehicle.
Therefore, do not leave any people behind in
the vehicle, particularly children, elderly peo-
ple or people in need of special assistance if
the vehicle has been locked with the key. As
a result, they may not be able to free them-
selves in the event of an emergency. As a
result, they could be seriously or even fatally
injured by prolonged exposure to extremely
high or low temperatures, for example. In this
case, rescuing people from outside the vehi-
cle is difficult.
Deactivate the interior motion sensor before
you lock the vehicle with the key. The doors can then be opened from the inside after the
vehicle has been locked from the outside with
the key.
G
WARNING
If children are left unsupervised in the vehicle,
they could:
R open a door from inside the vehicle at any
time, even if it has been locked
R start the vehicle using a key which has been
left in the vehicle
R release the parking brake
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time. 82
DoorsOpening and closing

Permanent SPEEDTRONIC
You can use the on-board computer to limit
the speed permanently to a value between
160 km/h(e.g. for driving on winter tyres) and
the maximum speed (Y page 241).
Shortly before the stored speed is reached, it
appears in the multifunction display.
Permanent SPEEDTRONIC remains active,
even if variable SPEEDTRONIC is deactivated.
You cannot exceed the stored limit speed,
even if you depress the accelerator pedal
beyond the pressure point (kickdown). DISTRONIC PLUS
Important safety notes DISTRONIC PLUS regulates the speed and
automatically helps you maintain the dis-
tance to the vehicle detected in front. DIS-
TRONIC PLUS brakes automatically so that
the set speed is not exceeded.
On long and steep downhill gradients, espe-
cially if the vehicle is laden or towing a trailer,
you must select shift range 1,2or 3in good
time. By doing so, you will make use of the
braking effect of the engine. This relieves the
load on the brake system and prevents the
brakes from overheating and wearing too
quickly.
If DISTRONIC PLUS detects a slower-moving
vehicle in front, your vehicle is braked in order
to maintain the preset distance to the vehicle
in front. G
WARNING
Do not change down for additional engine
braking on a slippery road surface. This could
cause the drive wheels to lose their grip and
the vehicle could skid. G
WARNING
DISTRONIC PLUS is only an aid designed to
assist driving. The driver remains fully respon-
sible for the vehicle's distance from other vehicles, the vehicle's speed and for braking
in good time.
DISTRONIC PLUS does not react in particular
to:
R pedestrians
R stationary obstacles on the road, e.g. stop-
ped or parked vehicles
R oncoming and crossing traffic
DISTRONIC PLUS may not detect narrow vehi-
cles driving in front, e.g. motorcycles, or vehi-
cles driving on a different line. Therefore,
always pay attention to traffic conditions even
when DISTRONIC PLUS is activated. Other-
wise, you may fail to recognise dangers in
time, cause an accident and injure yourself
and others. G
WARNING
DISTRONIC PLUS cannot take account of road
and traffic conditions. If DISTRONIC does not
recognise or no longer recognises the vehicle
in front, do not activate DISTRONIC or, if it is
already active, deactivate it. This is especially
the case:
R before corners
R on filter lanes
R when changing to a lane with faster moving
traffic
R in complex driving situations or where lanes
are diverted, e.g. at roadworks on a motor-
way
DISTRONIC PLUS otherwise maintains the
current speed set by you or accelerates up to
the set speed.
DISTRONIC PLUS cannot take account of
weather conditions. Deactivate, or do not
activate, DISTRONIC PLUS:
R if the roads are slippery, snow-covered or
icy. The wheels could lose their grip when
braking or accelerating. The vehicle could
start to skid.
R if the sensors are dirty or there is poor vis-
ibility, e.g. due to snow, rain or fog. Dis-
tance control may be impaired. 178
Driving systemsDriving and parking